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Related Experiment Videos

Restrictive clonal allocation in the chimeric mouse brain

C Y Kuan1, E A Elliott, R A Flavell

  • 1Section of Neurobiology, Yale University School of Medicine, New Haven, CT 06510, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 1997
PubMed
Summary
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Lineage restriction significantly shapes mammalian brain organization. Clonal analysis in chimeric mice shows distinct, confined distributions of embryonic stem cell descendants, suggesting progenitor cell fate constraints and dual origins for the cerebral cortex.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The role of lineage restriction in mammalian brain organization is not fully understood.
  • Investigating how progenitor cell divisions and migrations influence brain structure is crucial.

Purpose of the Study:

  • To determine the extent of lineage restriction in mammalian brain development.
  • To analyze the spatial distribution and potential fate constraints of clonally related cells.

Main Methods:

  • Generation of chimeric mice by injecting genetically tagged embryonic stem (ES) cells into blastocyst embryos.
  • Detailed examination of the distribution of labeled ES cell descendants in postnatal chimeric brains.

Main Results:

Related Experiment Videos

  • Vast majority of labeled ES cell descendants were confined to specific brain regions within each chimeric mouse.
  • Distinct patterns of cell deployment across different brain regions were observed.
  • Symmetrical distribution of descendants suggested common progenitors for bilateral structures.
  • Clones formed continuous bands in deep neocortical strata, supporting dual origins.

    • Conclusions:

    • Early diversified founder cells likely constrain descendant fates via restricted dispersion.
    • Bilaterally symmetrical brain structures may originate from shared progenitor populations.
    • The cerebral neocortex may arise from two distinct founder cell groups, aligning with dual phylogenetic origin hypotheses.